package com.ziyia.databasetest;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.widget.Toast;
import androidx.annotation.Nullable;

public class MyDatabaseHelper extends SQLiteOpenHelper {

    private Context context;

    private String createCategory = "create table Category (id integer primary key autoincrement, catgory_name text, category_code integer);";

    private String createBook = "create table Book(" +
            "id integer primary key autoincrement," +
            "author text," +
            "price real," +
            "pages integer," +
            "name text," +
            "category_id integer);";

    public MyDatabaseHelper(@Nullable Context context, @Nullable String name, @Nullable SQLiteDatabase.CursorFactory factory, int version) {
        super(context, name, factory, version);
        this.context = context;
    }


    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(createBook);
        db.execSQL(createCategory);
//        Toast.makeText(context, "数据库创建成功", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
//        db.execSQL("drop table if exists Book");
//        db.execSQL("drop table if exists Category");
//        onCreate(db);

        if (oldVersion <= 1) {
            db.execSQL(createCategory);
        }

        if (oldVersion <= 2) {
            db.execSQL("alter table Book add column category_id integer");
        }
    }
}
